Pivot connection for levers



Dec. 28 1926.

H. c. SCHAPER PIVOT CONNECTION FOR LEVERS Filed April 13 1923 fizamfawjv/za per Harry 6' JVZM Patented Dec. 28, 1926. 1 UNITED STATES HARRY C.SCHAPEB, 01' 8'1. LOUIS, MISSOURI, ASSIGNOR TO THE WEIGHT-O-GIR APHCOMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

- PIVOT CONNECTION FOR LEVERS.

Original application filed October 18, 1921, Serial No. 507,492. Dividedand this application filed April 13,

1828. Serial No. 681,902.

My invention relates to new and useful improvement in pivot connectionsfor levers and the present application is a division of an applicationfor patent on weight indicating scales filed by me October 13, 1921,Serial Number 507,492.

The objects of the present invention are to provide a simple andeflicient bear-m for the interengaging knives of a pair 0? cooperatinglevers.

Further objects of the invention are to provide a single bearing memberhaving bearing faces on its opposite sides for engaging the oppositelydisposed knife edges of the levers and to rovide means for retaining thebearing b ock in operative relation with one of said levers.

With these and other objects in view my invention consists in certainnovel features of construction and arrangement of parts hereinafter morefully described claimed, and illustrated in the accompanying drawings,in which' Figure 1 is a longitudinal cross section through the base of ascale in which are housed the interengaged load actuated levers.

Figure 2 is a fragmental plan view of the inter-engaged levers.

Figure 3 is a vertical cross section taken on line 33 of Figure 2.

Figure 4 is a vertical crosssection taken on line 44 of Figure 3.

Figure 5 is a detail perspective View ofthe retainin plate.

Figure 6 1s a detail perspective view of the bearing member.

Referring by numerals to the accompanying drawings, 10 indicates abox-shaped base which houses the load receiving lever system of a scale.Projecting inwardly from the side walls of said base are cylindricalportions 11 in which are mounted bearings 12. The upperends of thesehearings carry bearing blocks 14' having upwardly presented V-shapedgrooves in which are arranged the knife edges of pivot members 15. Thesepivot members are fixed in the ends of a pair of spacedparallel bars 16and 17,

transversely disposed in the base 10, The bar 16 which occupies theforward end of the base'lO has inwardly projecting arms 16 to theextremities of which are fixed upwardly presented knife-edge pivotmembers 18. The bar 17, which is located toward and.

the rear of the base 10, has inwardly projecting arms 17 and theextremities thereof are provided with upwardly presented pivot memberssimilar to members 18.

A bearing block 19 carried by the upper end of a loop 20 is providedwith a downwardly presented V-shaped groove which is designed to beengaged by the knife edge of the pivot member 18 and support the loops20 on the arms 16 and 17. These loops straddle the ends of said arms,and the lower ends of said loops are designed to receive the hookedupper ends of short rods 21. The lower ends of said rods have adjustablymounted thereon semi-spherical members 22, which are received inbearings formed in the undersides of the stirru s 24 and support thesame in position. he upper ends of the stirrups 24 are secured to,'orformed integral with a spider 25 which extends upwardly through asuitable opening for ed in the upper end of base 10. This spic er 1 isprovided at its corners, and preferably in vertical alignment with pivotconnections 19 and 20, with bosses 26 having suitable sockets forreceiving the ins 27 of a platform 28. Thus the platf drm 28, which isarranged above the spider 25 and is spaced from and surrounds the upperend of the base 10, is supported in position and suspended from the arms16 and 17 by the loops 20 and the stirrups 2A.

A lever 29 is fixed at its forward end to the bar 16 and extendsrearwardly in the base 10 and its extreme rear end carries a noseportion 30, which is designed to be engaged by a loop 31 fixed to thelower end of a steel yard rod 32 the upper endof which is connected tosuitable weight indicating mechanism. A lever 34 extends inwardly andforwardly from the bar 17 and is preferably bifurcated at 34 to clearthe lever 29, and the forward end of said lever extends upwardly througha slot 35 formed in the lever 29, and is provided with a horizontallydisposed portion 36 which occupies a position above the lever 29, asshown in Figures 1 and. 3. This horizontal portion has arranged thereina block 37, in which is fixed a downwardly presented knife edge member38 which is adapted to have bearing in the upwardly presented V-shapedgroove of a bearing member 39.

A knife-edge pivot member 40 is fixed to the lever 29 transversely inthe slot 35, and

its upwardly .presented knife-edge has a bearing in the downwardlypresented V- of the member 39 are vertically aligned with each other sothat the knife-edge members 38 and 40 of the levers 34 and 29,respectively, are maintained in proper alignment with each other asshown 1n Figure 3.

The provision of bearing the block- 39 ermits the use of a plurality ofpivot points etweenthe interengaged levers sothat the operating strainis distributed over a number of plvot members instead of beingconcentrated at a single point thereby insuring the sensitive operationof the device and prolonging the life of the knife-edge members. Theblock 37 is preferably held in position in the horizontal portion 36 ofthe lever 34 by a in 41 which passes through said block, an is seated inthe portion 36. This pin permits slight movement of the block 37, thuspermitting the knife-edge member 38' to automatically adjust itselfrelative to the bearing block 39, and the knife-edge member 40. Toprevent the displacement and loss of bearing member 39,

.when the levers are disassembled, a pair of retaining plates 42 aresecured to the ends of the block 37, and-have at their lower endsinwardly projecting lateral portions 44 which when the lever 34 isremoved fromits position on the lever 29 are adapted to engage theprojections 45 formed on the block 39 and retain the memberin operativerelation with the knife-edgemember 38.

The plates 42 are of sufficient length so that when the lever 34occupies operative position on the lever 29, and the member 39 isengaged by the knife-edge members38 and 40, the projections 44 formed onthe lower ends of the plates 42 are spaced a suflicient distance belowthe projections 45 on the member 39 to provide operating clearancetherebetweem'and not interfere with the operation of the member 39.

I claim:

1. In a scale, a pivot connection'for interengaged levers, comprising apair of opposed knife-edge members, aself adjusting connection betweenone ofsaid members and its lever, and a bearing block interposed betweenthe knifeedges, said bearing block being provided with seats adapted toreceive the respective knife edges.

2. In a'scale, apivot connection for inter engaged levers, comprising apair of opposed knife-ed'ge members, a self adjusting connection betweenone of said members and its levers including a pivotpin, and a bearingblock interposed between the knife edges, said bearing block beingprovided with seats adapted to receive the respective knife edges.

3. ,In a scale, a pivot connection for interblock, and a bearing blockinterposed between the knife edges, said bearing block being providedwith seats adapted to receive the respective knife edges.

4. In a scale, a pivot connection for interengaged levers, comprising apair of opposed knife-edge members, a self adjusting connection betweenone of, said members and its levers including a channel in the end ofthe lever and a-block pivotally supported in said channel, and a bearingblock interposed between the knife edges, said bearing lock beingprovided with seats adapted to receive the respective knife edges.

5. In a pivot device for levers, a pair of opposed knife-'edge'members,and a bearing block having oppositely disposed V-shaped grooves forinterengaging said members.

6. In a pivot device for levers, a pair of opposed knife-edge members,and a bearing block provided" on its opposite faces with verticallyaligned V-shaped grooves for engagin said knife-edgemembers.

7 n a pivot device for levers, a pair of opposed knife-edge members, agrooved bearing blocked for interengaging said members and maintainingthe fulcrum thereof in vertical plane, and means for retaining saidblock in operativerelation with one of said knife-edge members.

8. In a pivot device for levers, the combination with a pair of levers,of a bearing member provided in its oppositely disposed faces withV-shaped grooves for providing knife-edge pivot engagements with saidlevers, and means for retaining said bearing memberin operative relationwith one of bearing block provided in its upper and lower faces withV-shaped grooves. a knifeedge pivot member carried by one of said leversand engaging the lower end of said grooves, and a knife-edge pivotmember carried by the free end of the other end of said levers andengaging the upper end of said grooves.

In testimony whereof I hereunto afiix my signature this 30th day ofMarch. 1923.

- HARRY C. SCHAPER.

